I will assume you mean sex.
If she's shy enough to make you think she's a virgin, you don't. If she wants to say something, she will, and if she doesn't, asking will likely offend her. (and if she's outgoing enough that she wouldn't be, then she probably has.
Either way, sexual experience tends to loosen the holes (I'm sorry, there's really no other way to say it), so virgins are usually extremely tight...unless they masturbate a fair bit.
TL;DR: You don't. There are much better ways to bring up the subject (such as slowly intensifying bodily contact, as long as you back off if she pulls away)
you ask around
You have to really get to know her and what she's like. If you find that you really like her then you can ask her around 2 weeks. But this is only if you really get to know her.
girl and boy adviceThe amount of time a girl should wait for a guy to ask her out before she does it herself is approximately 3 days.
Ask him out before the other girl.
Ask the girl and try not to be shy and I am a girl myself and if they were joking around while asking me out I would say no witch did happen before but I am 13 and I am single
use msn or facebook if you get nervous around the girl
If you want to go out with a girl you should always try and get to know her better before you ask her out.
You goof around and be funny
Omg I'm a girl i would hate it if a guy asked me to the dance the day of you can ask her to dance on the day of or you can ask her to the dance the day before
first do not follow her around that is stupid then you just go up and ask her out
Well go up to her and ask how she is doing and ask her to hang out and just ask want to hang out soon I'm a girl and I know !!:)
myth